[132466] in North American Network Operators' Group
Re: Jumbo frame Question
daemon@ATHENA.MIT.EDU (Adrian Chadd)
Thu Nov 25 19:19:35 2010
Date: Fri, 26 Nov 2010 08:19:27 +0800
From: Adrian Chadd <adrian@creative.net.au>
To: Harris Hui <harris.hui@hk1.ibm.com>
In-Reply-To: <OFC3AC63A5.89DA6AE7-ON482577E6.0083ABB6-482577E7.00014359@hk1.ibm.com>
Cc: nanog@nanog.org
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
TCP maximum window sizes.
Application socket buffer sizes.
Fix those and re-test!
Adrian
On Fri, Nov 26, 2010, Harris Hui wrote:
>
>
> Hi
>
> Does anyone have experience on design / implementing the Jumbo frame
> enabled network?
>
> I am working on a project to better utilize a fiber link across east coast
> and west coast with the Juniper devices.
>
> Based on the default TCP windows in Linux / Windows and the latency between
> east coast and west coast (~80ms) and the default MTU size 1500, the
> maximum throughput of a single TCP session is around ~3Mbps but it is too
> slow for us to backing-up the huge amount of data across 2 sites.
>
> The following is the topology that we are using right now.
>
> Host A NIC (MTU 9000) <--- GigLAN ---> (MTU 9216) Juniper EX4200 (MTU 9216)
> <---GigLAN ---> (MTU 9018) J-6350 cluster A (MTU 9018) <--- fiber link
> across site ---> (MTU 9018) J-6350 cluster B (MTU 9018) <--- GigLAN --->
> (MTU 9216) Juniper EX4200 (MTU 9216) <---GigLAN ---> (MTU 9000) NIC - Host
> B
>
> I was trying to test the connectivity from Host A to the J-6350 cluster A
> by using ICMP-Ping with size 8000 and DF bit set but it was failed to ping.
>
> Does anyone have experience on it? please advise.
>
> Thanks :-)
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